REFUGEES arriving from the Middle East in their thousands in search of a better life will be prime candidates for radicalisation once they realise Britain isn't the land of milk and honey.

Chris Ryan believes the pressure is high on security services in the wake of the migrant crisis

That's the view of Chris Ryan, an SAS hero who made an extraordinary escape from Iraq during the first Gulf War. Over the last 20 years he has extensively researched war and terrorism for a series of novels.

He has previously forewarned of the dangers of destabilising countries such as Syria and Iraq, which is where Islamic State is rapidly growing.

Now he believes an imminent threat for Britain comes in the shape of migrants heading over from those disaster zones, both in the form of highly-trained ISIS operatives intent on wreaking havoc and those radicalised once they are here.

Speaking to Express.co.uk today, Ryan said: "It's critical there's some way to register refugees coming here and we must having a list of who's in the country because there's a risk of undesirables infiltrating Britain, trained in making explosives. In effect, they can wreck huge devastation.

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"Some people who will come over here will find this world isn't as rosy as they hoped.

"They will find it difficult to live in a new culture and will be open to hate preachers who will radicalise them, telling them how they're being let down."

Ryan, whose latest novel, Hellfire, focuses on a terror plot born out of the burgeoning relationship between ISIS and feared Boko Haram in Nigeria, believes the vast majority arriving coming in the migrant crisis have honest intentionsthe migrant crisis but the situation is fraught.

They will find it difficult to live in a new culture and will be open to hate preachers who will radicalise them

Chris Ryan

The SAS man, who was part of the Bravo Two Zero patrol which was catastrophically compromised in 1991, said the focus must be on those who could cause problems in Britain, with the burden resting on the shoulders of the intelligence agencies.

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"They are coming over to Europe in their thousands. It's disgraceful what's happening to those poor families and what's driven then to make that journey.

"A couple of weeks ago people were thinking they just want to come here to get benefits and get a house but now we've doctors, businessmen, lawyers, real professionals fleeing the Middle East to try to get to a safe haven.

"It's a real mess."

Hellfire by Chris Ryan is out now published by Coronet, £18.99 Follow Chris on Twitter @exSASChrisRyan or at www.facebook.com/ChrisRyanBooks